This Recommendation gives the characteristics of a synchronous digital multiplex equipment, to combine up to 31 tributary channels at 64 kbit/s or n x 64 kbit/s in a 2048 kbit/s digital stream.

• 本建议给出了一种同步数字复用设备的特性，它能将多达31个64 kbit/s 的支路合并成2048 kbit/s 的数字流。